Mathnasium 554 Green Bay Rd, Kenilworth IL 60043 (847) 251-3200

Contact Us for a No-Risk Assessment!

* indicates a required field
  • phone number format invalid
  • email format invalid
Problems detected, please review the form.
protected by reCAPTCHA
Privacy - Terms

Our Team

Our specially trained math instructors will teach your child how to understand math in an individual setting; our unique approach enables us to explain concepts really well and lend a helping hand to every student. Our tutors foster a caring, encouraging environment that helps kids thrive and learn! Read below to learn more about our talented team:


Center DirectorEllen Deinzer, Center Director

Ellen has a Bachelor’s degree in math from Lewis University and a Master’s degree in math from Loyola University. Ellen enjoys shopping, manicures and listening to all types of music, the more obscure the better. Her goal is to provide outstanding math tutoring and homework help to Kenilworth students…or be a Disney princess. She enjoys sharing the feeling of accomplishment when a student solves a problem correctly.


John Nations, Assistant Center Director

Since graduating from New Trier High School, John earned his Bachelor's Degree from Wake Forest University in Economics. At an early age, he became very interested in math and problem solving. His other passion has been working with children. He has worked as an assistant soccer coach and spent many summers teaching tennis at Old Willow Club here in Glenview. John is looking forward to sharing his passion for math with students and teaching them fun, creative ways to solve problems. 

Nika Walczak, Administrative Assistant

Nika was born in Poland, and moved to the US at the age of 7. She graduated from New Trier High School, and continued on to graduate from Loyola University in Chicago with a history major. After college she lived in Japan on the island of Hokkaido as an Assistant Language Teacher, teaching English to high school students in the town of Engaru. After returning home to Wilmette, Nika spent several years as a volunteer at the Field Museum of Natural History, where she continued expanding on her love of history and culture as a docent in the Inside Ancient Egypt exhibit. Currently an administrative assistant at Mathnasium of Kenilworth, Nika enjoys writing in her spare time, as well as taking care of her two cats and one dog.

OwnerJ. Steve Santacruz, Owner

Steve graduated from DePaul University from the Honors Accounting Program with a Bachelor of Science in Accounting and later received his law degree from DePaul. One of Steve's main passions in life is teaching children. He has been a little league baseball coach since college and enjoys coaching his own two boys in baseball. Steve brings that passion to Mathnasium - hoping to influence and enrich the lives of children through nurturing a passion and appreciation for math. Most students simply need more focused instruction in order to excel. "The Mathnasium method achieves this and much more, due to the richness and breadth of the Mathnasium curriculum. It is the ideal adjunct for a student?s daily classroom instruction, whether the child is struggling or advanced." Through Mathnasium, Steve is excited about being able to teach math to children in a way that makes sense to them. He also looks forward to teaching children the importance of strong study skills, which will serve them in subjects beyond math as they make their way through high school and on to college. Steve and his wife, Karen, are busy raising two sons, Austin and Dylan. They look forward to serving your family!

OwnerKaren Santacruz, Owner

Karen graduated from Western Illinois University with a Bachelor of Science in Physical Education with an emphasis in Athletic Training. She has a Master of Science from Northeastern Illinois University in Exercise Science and Cardiac Rehabilitation. Before starting a family Karen worked as an Athletic Trainer for Illinois Sportsmedicine and Addison Trail High School. She then taught physical education and was the Head Athletic Trainer at Stevenson High School. While raising their two boys Karen has taught PE part-time, coaches her sons' sports teams, is a substitute teacher, and volunteers her time in boy scouting and at St. Joseph school. Karen loves working with children, and is excited about opening Mathnasium!! She has always been a strong advocate for developing fitness in children, and knows how important math skills are to the overall educational development of a child. "I've always been a firm believer in teaching kids in a way they can understand. This allows for a love of learning whatever the subject!! The Mathnasium method does this so well, and allows kids to "work out" their minds!"

Betty Wang, Director of Operations, Owner

Betty graduated from New Trier High School and obtained her Bachelor of Science from Northwestern University in Biomechanical Engineering. Mathnasium's philosophy on learning and teaching resonated with Betty's belief that learning is at its best when it occurs in a nurturing environment where students can cast aside their fear and frustration. "Mathnasium offers an unique learning environment and individualized learning plans to helps students make sense of Math. It really makes math fun!" 


Sam Larimer, Director of Training/Operations Associate

Sam hails from northwest Indiana, where he completed his B.S. in Mathematics and minor in Civil Engineering at Purdue University Calumet. His interests vary all over the spectrum, from the great outdoors to an engrossing role-playing game to rooting for the Cubbies, Bears & Blackhawks. Most of all, though, his adoration for math has led him to pursue interests in actuarial science and statistics. New to the North Shore, he is excited to help Mathnasium students break into the puzzle-solving world of math that he’s enjoyed his entire life.